I'd suggest looking through the "Parts" section at
www.imperialclub.com and looking to the bottom for salvage yards. There are several reputable people that should have the entire list, including Imperial Heaven and Lowell Howe, among others.
We have a number of newer members, and the question about where to find parts is one that usually comes up often here. If you have not strolled around the website lately, you owe it to yourself. There's some really dynamite content that's been added lately to almost every year.